Computer fan



FIG. 1 is a top rear perspective view of a computer fan showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image;

FIG. 5 is a rear-end elevational view thereof;

FIG. 6 is a front elevational view thereof.

The cords are shown in broken lines in all views for illustrative purposes only. 

The ornamental design for a computer fan, as shown and described. 